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8#include <linux/kernel.h>
9#include <linux/percpu.h>
10#include <linux/debugfs.h>
11#include <linux/seq_file.h>
12#include <linux/cpumask.h>
13#include <asm/hvcall.h>
14#include <asm/firmware.h>
15#include <asm/cputable.h>
16#include <asm/trace.h>
17#include <asm/machdep.h>
18
19
20struct hcall_stats {
21 unsigned long num_calls;
22 unsigned long tb_total;
23 unsigned long purr_total;
24 unsigned long tb_start;
25 unsigned long purr_start;
26};
27#define HCALL_STAT_ARRAY_SIZE ((MAX_HCALL_OPCODE >> 2) + 1)
28
29DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
30
31
32
33
34static void *hc_start(struct seq_file *m, loff_t *pos)
35{
36 if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
37 return (void *)(unsigned long)(*pos + 1);
38
39 return NULL;
40}
41
42static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
43{
44 ++*pos;
45
46 return hc_start(m, pos);
47}
48
49static void hc_stop(struct seq_file *m, void *p)
50{
51}
52
53static int hc_show(struct seq_file *m, void *p)
54{
55 unsigned long h_num = (unsigned long)p;
56 struct hcall_stats *hs = m->private;
57
58 if (hs[h_num].num_calls) {
59 if (cpu_has_feature(CPU_FTR_PURR))
60 seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
61 hs[h_num].num_calls,
62 hs[h_num].tb_total,
63 hs[h_num].purr_total);
64 else
65 seq_printf(m, "%lu %lu %lu\n", h_num<<2,
66 hs[h_num].num_calls,
67 hs[h_num].tb_total);
68 }
69
70 return 0;
71}
72
73static const struct seq_operations hcall_inst_seq_ops = {
74 .start = hc_start,
75 .next = hc_next,
76 .stop = hc_stop,
77 .show = hc_show
78};
79
80static int hcall_inst_seq_open(struct inode *inode, struct file *file)
81{
82 int rc;
83 struct seq_file *seq;
84
85 rc = seq_open(file, &hcall_inst_seq_ops);
86 seq = file->private_data;
87 seq->private = file_inode(file)->i_private;
88
89 return rc;
90}
91
92static const struct file_operations hcall_inst_seq_fops = {
93 .open = hcall_inst_seq_open,
94 .read = seq_read,
95 .llseek = seq_lseek,
96 .release = seq_release,
97};
98
99#define HCALL_ROOT_DIR "hcall_inst"
100#define CPU_NAME_BUF_SIZE 32
101
102
103static void probe_hcall_entry(void *ignored, unsigned long opcode, unsigned long *args)
104{
105 struct hcall_stats *h;
106
107 if (opcode > MAX_HCALL_OPCODE)
108 return;
109
110 h = this_cpu_ptr(&hcall_stats[opcode / 4]);
111 h->tb_start = mftb();
112 h->purr_start = mfspr(SPRN_PURR);
113}
114
115static void probe_hcall_exit(void *ignored, unsigned long opcode, long retval,
116 unsigned long *retbuf)
117{
118 struct hcall_stats *h;
119
120 if (opcode > MAX_HCALL_OPCODE)
121 return;
122
123 h = this_cpu_ptr(&hcall_stats[opcode / 4]);
124 h->num_calls++;
125 h->tb_total += mftb() - h->tb_start;
126 h->purr_total += mfspr(SPRN_PURR) - h->purr_start;
127}
128
129static int __init hcall_inst_init(void)
130{
131 struct dentry *hcall_root;
132 struct dentry *hcall_file;
133 char cpu_name_buf[CPU_NAME_BUF_SIZE];
134 int cpu;
135
136 if (!firmware_has_feature(FW_FEATURE_LPAR))
137 return 0;
138
139 if (register_trace_hcall_entry(probe_hcall_entry, NULL))
140 return -EINVAL;
141
142 if (register_trace_hcall_exit(probe_hcall_exit, NULL)) {
143 unregister_trace_hcall_entry(probe_hcall_entry, NULL);
144 return -EINVAL;
145 }
146
147 hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
148 if (!hcall_root)
149 return -ENOMEM;
150
151 for_each_possible_cpu(cpu) {
152 snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
153 hcall_file = debugfs_create_file(cpu_name_buf, 0444,
154 hcall_root,
155 per_cpu(hcall_stats, cpu),
156 &hcall_inst_seq_fops);
157 if (!hcall_file)
158 return -ENOMEM;
159 }
160
161 return 0;
162}
163machine_device_initcall(pseries, hcall_inst_init);
164
